Thomas mcilkoy



A(No Model.) l

TAB/101mm'.

GRIPPER ATTAGHMENT-FORPRINTING ,I DRESSES.I No. 255,181. f PatentedMar.21.1882.

MIM

UNITED? STATES THOMAS' ivteiLROY, OF BROOKLYN, NEWYORKQ GRIPEIRIAv`|"l'\`jC`Hl\/ IENT FOR PRINTING-PRESSES.

.SPECIFICATION forming part of Letters Patent No. 255,181,l dated March21, 1882-,

Application tiled May 2, 1881. (No model.)

To all whom it may concern:

Be it known that I, THOMAS MCILROY, of

Brooklyn, in the c ounty'of Kings and State of New York, have inventedan Improvement in Griper AAttachments for Printing-Presses, of

which the following is avspecitication.

1n printingLpresses the sheet is usuallytaken from the feed-boardbygripers upon the impression cylinder. These gri pers are comparativelyclose together', and hence'arc adapted to sheets of different sizes; butthe fingers or tongues upon which the sheet rests when taken by thegripers have to be adjusted to suit the position of the sheet that is tobe printed, and also the positions ofthe gripers, for they must notinterfere with the gripers on the inipres sion-cylinder as they Hyaround and catch the sheet. In transferring the sheet from the impression-cylinder to the delivery or fly cylinder a second set otgripers is employed on the second cylinder, and these have to be placedsoas to grasp the sheet and remove it from the impression-cylinder, andthese second gripers must be adapted to the size ot' sheet that is to beprinted, so as to grasp the same firmly and take the sheetaway;butthesecoud gripers must not come into contact vwith the gripers on theimpression-cylinder.

The object of my invention is to facilitate the adjustment of the secondset of gri pers to `take the sheet from the gripers of theimpression-cylinder, and to allow for the supporting tongues or iingersat the lower end ot' the feedtable 'being properly placed by the simpleinspection of the under side of the feed-table, when the lowerhingedportion thereof isturned back for that Iiurposqthereby lesseniug theatnountof time and labor expended in placing the parts properly whenthere is a change in the printing that is done on the press.

Inl the drawings, Figure 1 is a side view of the printing-press as faras necessary 'to illustrate the special feature ot' `my improvement.Fig.2shows part of the under side ot' the hinged feedboard; and Fig. 3shows the indicator-bar that is employed in setting the gripers of thesecond or transfer cylinder.

The impression-cylinder a is provided with the row ot gripers b uponlthe shaft c. These 5o are of any usual character.

d is the t.'eed-table,with the feed-board eacross its lower end, thesame being hinged at c', so f -that it may be turned back upon thefeed-table for the adjustment of'. the sheet-supporting'. Afingers ortonguesf, that project over theillt pression-cylinder. VEach finger hasa block at its backend, that is notched to set over. a dovetailed bar,i, and the said blocks-'canbe moved laterally, so as to place thefingers in the required position for holding the lower 6o edge ot' thesheet ready to be taken by the gripers, and each finger is retained inplace by friction after it has been adjusted to position. lis the gagefor the lower edge of the sheet.

The parts thus far described are of the usual construction; but it isdifficult to adjust the positions ot' the fingers or tongues f so thatthe sheet will be properly supported without the risk of the lingersbeing in the way of the gripers upon the impression-cylinder. cilitatethis I make use of indicator-marks upon the dovetailed bar i, or uponthe under side of the feed-board, that denote the places'where thegriper-tiugers are upon the impression-cylinder, so that when thefeed-board is turned over 7 5 and the fingers are being moved into thepositions required for supporting the sheetitisonlyr necessary to avoidplacing the supporting-tingers at the places thatcorrespond with thegrip-m ers. Hence when thefeed-boardis turned back 8o to its place thefingers will be adapted tosup V porting the sheet, and also be out ofthe way of the gripers. Hence there is no time lost in turning thefeed-board back and moving the lingers in one direction or the other,and then trying the parts to see if they are properly placed, and thisadjustment of the fingers can be made without the necessity of turningthe impressioncylinder around so that the gripers are adjacent to thefingers. In placing the 9o second set of gripers, n, which are upon thedelivery or iy cylinder o, still more difficulty has been experienced,becausethe gripers of the delivery-cylinder are inaccessible when theyare near the gripers of the impression-cylinder. 95

In order, therefore, to enable the workman to know exactly where thegripers of the impression-cylinder are placed, I make use of an in.-dicator-bar, r, upon which are marked the positions of the gripers onthe impressionv-cyliuroo der, and this bar r is rmly secured between theframes of the press near the under side of To fa- 7o the feed-table, andin the place where it is most convenient to obtain access to the gripersn. Hencein setting these gripersit is only required that a comparison bemade of the gripers with the indicator-har to enable the workman to setthe gripers u so that they will entirely avoid the gripers bof theimpression-cylinder as the sheet is taken from the impression-cylinderto the delivery or ily cylinder. By means of this indicator-har the lossof time usually arising in setting the gripers ofthe delivery-cylinderis avoided.

I remark that I prefer and use separate pulleys, each one having agriper, n, and move the pulleys cndwise of the shaft, so as to set thepulleys andgripers in the required places, instead of hayi n g acomplete cylinder for said gripers.

The marks may he made upon the shaft of the delivery-cylinder, ifdesired, for indicating the position of the grpers on theimpressioncylinder.

I claim as my invention- 1. The combination, with the impression-cylinder and its gripcrs, of a hinged feed-board, 2 5adjustable fingers, a bar carrying the same, and an indicator at theunder side of such feedboard to denote the positions of the gripers,substantially as set forth.

2. The combination, in a pri11ting-prcss,of 3o the impression-cylinderand gripers, adeliverycylinder and gripers, and an indicator havingmarks that denote the positions of the gripers on theimpression-cylinder, substantially 'as set forth, whereby the gripers ofthe delivery-cy1 inder can be placed so as to avoid contact with the'gripers on the impression-cylinder, substantially as specied. A

Signed by me this 27th day of April, A. I). 1881.

THOMAS MOILROY. Witnesses:

GEO. T. PINCKNEY, WILLIAM G. MOTT.

